> For the complete documentation index, see [llms.txt](https://docs.bosagora.org/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bosagora.org/en/getting-started/erc-20-tokens.md).

# ERC-20 Tokens

An ERC20 token must implement the interface `IERC20` in [IERC20.sol](file:///Users/henry/dev/docs-biznet/source/en/biznet/develop/IERC20.sol). This is a template contract [ERC20Token.template](file:///Users/henry/dev/docs-biznet/source/en/biznet/develop/ERC20Token.template). Users just need to fill in `_name`, `_symbol`, `_decimals` and `_totalSupply` according to their own requirements:

```
  constructor() public {
    _name = {{TOKEN_NAME}};
    _symbol = {{TOKEN_SYMBOL}};
    _decimals = {{DECIMALS}};
    _totalSupply = {{TOTAL_SUPPLY}};
    _balances[msg.sender] = _totalSupply;

    emit Transfer(address(0), msg.sender, _totalSupply);
  }
```

Then users can use [Remix IDE](https://remix.ethereum.org/) and [Metamask](file:///Users/henry/dev/docs-biznet/source/en/biznet/wallet/tutorials/metamask.md) to compile and deploy the ERC20 contract to BizNet.

### Interact with Contract with [Web3](https://www.npmjs.com/package/web3) and NodeJS.

#### Connect to BizNet's public RPC endpoint

```js
const Web3 = require('web3');
// mainnet
const web3 = new Web3('https://mainnet.bosagora.org');

// testnet
const web3 = new Web3('https://testnet.bosagora.org');
```

#### Create a Wallet

```javascript
web3.eth.accounts.create([entropy]);
```

Output:

```bash
web3.eth.accounts.create();
{
  address: '0x926605D0729a968266f1BB299d8Df0471C4F5367',
  privateKey: '0x6b4618539d95f205f33e916e89404b301dde545c0c4acc181fd0c0b42708bad3',
  signTransaction: [Function: signTransaction],
  sign: [Function: sign],
  encrypt: [Function: encrypt]
}
```

#### Recover a Wallet

```javascript
const account = web3.eth.accounts.privateKeyToAccount("0xe500f5754d761d74c3eb6c2566f4c568b81379bf5ce9c1ecd475d40efe23c577")
```

#### Check Balance

```javascript
web3.eth.getBalance(holder).then(console.log);
```

Output:

The balance will be bumped by e18 for BOA.

```
6249621999900000000
```

#### Create Transaction

**Parameters**

* Object - The transaction object to send:
* from - String|Number: The address for the sending account. Uses the web3.eth.defaultAccount property, if not specified. Or an address or index of a local wallet in web3.eth.accounts.wallet.
* to - String: (optional) The destination address of the message, left undefined for a contract-creation transaction.
* value - Number|String|BN|BigNumber: (optional) The value transferred for the transaction in wei, also the endowment if it’s a contract-creation transaction.
* gas - Number: (optional, default: To-Be-Determined) The amount of gas to use for the transaction (unused gas is refunded).
* gasPrice - Number|String|BN|BigNumber: (optional) The price of gas for this transaction in wei, defaults to web3.eth.gasPrice.
* data - String: (optional) Either a ABI byte string containing the data of the function call on a contract, or in the case of a contract-creation transaction the initialization code.
* nonce - Number: (optional) Integer of a nonce. This allows overwriting your own pending transactions that use the same nonce.

```
	// // Make a transaction using the promise
	web3.eth.sendTransaction({
	    from: holder,
	    to: '0x0B75fbeB0BC7CC0e9F9880f78a245046eCBDBB0D',
	    value: '1000000000000000000',
	    gas: 5000000,
        gasPrice: 18e9,
	}, function(err, transactionHash) {
      if (err) {
        console.log(err);
        } else {
        console.log(transactionHash);
       }
    });
```